Yeah, for some reason someone (in marketing) thinks that wheelguns are lacking in power. All of these 44's, 445's, 454's, 460's, 475's, and 500's just don't cut it anymore, They are thinking that a 20mm revolver would be nice...
I have 5 44 Magnums and I love shooting all of them.
20MM revolvers? I can tell you all about them! But video is so much more entertaining.
.44 mag is more than good enough for most (if not all) handgun applications. It's comfortable, versatile and easily/commonly re-loadable. The other one I would be tempted by is the .460 XVR. The ability to shoot 3 different factory loads (.45 Colt, .454 Cassul, .460 S&W) makes it very appealing.